Revenue (Disaggregation of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total	$ 506,468	$ 347,502
Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	76,806	73,231
Primary nutrients
Disaggregation of Revenue [Line Items]
Total	71,659	45,690
Service
Disaggregation of Revenue [Line Items]
Total	12,687	10,604
Products and co-products
Disaggregation of Revenue [Line Items]
Total	217,632	154,863
Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	92,065	49,875
Other
Disaggregation of Revenue [Line Items]
Total	35,619	13,239
Trade
Disaggregation of Revenue [Line Items]
Total	168,439	108,715
Trade | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	0	0
Trade | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	0	0
Trade | Service
Disaggregation of Revenue [Line Items]
Total	1,454	1,686
Trade | Products and co-products
Disaggregation of Revenue [Line Items]
Total	71,988	53,165
Trade | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	92,065	49,875
Trade | Other
Disaggregation of Revenue [Line Items]
Total	2,932	3,989
Ethanol
Disaggregation of Revenue [Line Items]
Total	149,403	102,314
Ethanol | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	0	0
Ethanol | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	0	0
Ethanol | Service
Disaggregation of Revenue [Line Items]
Total	0	0
Ethanol | Products and co-products
Disaggregation of Revenue [Line Items]
Total	145,644	101,698
Ethanol | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	0	0
Ethanol | Other
Disaggregation of Revenue [Line Items]
Total	3,759	616
Plant Nutrient
Disaggregation of Revenue [Line Items]
Total	169,252	124,913
Plant Nutrient | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	76,806	73,231
Plant Nutrient | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	71,659	45,690
Plant Nutrient | Service
Disaggregation of Revenue [Line Items]
Total	1,289	182
Plant Nutrient | Products and co-products
Disaggregation of Revenue [Line Items]
Total	0	0
Plant Nutrient | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	0	0
Plant Nutrient | Other
Disaggregation of Revenue [Line Items]
Total	19,498	5,810
Rail
Disaggregation of Revenue [Line Items]
Total	19,374	11,560
Rail | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	0	0
Rail | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	0	0
Rail | Service
Disaggregation of Revenue [Line Items]
Total	9,944	8,736
Rail | Products and co-products
Disaggregation of Revenue [Line Items]
Total	0	0
Rail | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	0	0
Rail | Other
Disaggregation of Revenue [Line Items]
Total	$ 9,430	$ 2,824